Attenuation relations of Arias intensity based on the Chi-Chi Taiwan earthquake data |
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| Authors: | H Hwang C K Lin Y T Yeh S N Cheng K C Chen |
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| Institution: | a Center for Earthquake Research and Information, The University of Memphis, 3876 Central Avenue, Memphis, TN 38152, USA;b Digital Earth and Disaster Reduction Research Center, Ching Yun university, 229 Chien Hsin Road, Jung-Li, Taiwan, ROC;c Institute of Earth Sciences, Academia Sinica, P.O. Box 1-55, Taipei, Taiwan, ROC |
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| Abstract: | This paper presents a derivation of attenuation relations of Arias intensity for various site conditions based on the strong-motion data recorded in the 1999 Chi-Chi Taiwan earthquake. The data are from the mainshock and three large aftershocks with stations in the footwall area and in the area away from the fault. At each station, Arias intensity is computed from two horizontal acceleration time histories. The Arias intensity data are separated into four groups according to site classes assigned to recording stations. For each site class, the attenuation relation of Arias intensity is derived using a two-step regression analysis method. The attenuation relations established in this study can be used to estimate Arias intensity from a rupture of a thrust fault for sites in the footwall area or in the area away from the fault. |
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| Keywords: | Arias intensity Attenuation relation Chi-Chi earthquake Ground motion Site effect |
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